Ingredient
Nisin
Also known as E234
A bacteriocin from Lactococcus lactis, permitted as a preservative, active against Gram-positive organisms including Listeria and clostridia.
Nisin is the best known bacteriocin used as an actual food additive, produced by Lactococcus lactis and permitted, with defined limits, as preservative E234. It acts on Gram-positive bacteria, which brings Listeria and the clostridia into range, and it survives heat well. In cured meat it is one more hurdle rather than a control on its own, most useful in the vulnerable early window before acidity and drying have taken hold.